Annotation of parser3/src/main/pa_sql_driver_manager.C, revision 1.92
1.54 paf 1: /** @file
2: Parser: sql driver manager implementation.
3:
1.91 moko 4: Copyright (c) 2001-2012 Art. Lebedev Studio (http://www.artlebedev.com)
1.61 paf 5: Author: Alexandr Petrosian <paf@design.ru> (http://paf.design.ru)
1.63 paf 6: */
1.54 paf 7:
8: #include "pa_sql_driver_manager.h"
9: #include "ltdl.h"
1.71 paf 10: #include "pa_threads.h"
1.54 paf 11: #include "pa_sql_connection.h"
12: #include "pa_exception.h"
13: #include "pa_common.h"
14: #include "pa_vhash.h"
15: #include "pa_vtable.h"
1.80 paf 16: #include "pa_charsets.h"
1.54 paf 17:
1.92 ! moko 18: volatile const char * IDENT_PA_SQL_DRIVER_MANAGER_C="$Id: pa_sql_driver_manager.C,v 1.91 2012/03/16 09:24:14 moko Exp $" IDENT_PA_SQL_DRIVER_MANAGER_H IDENT_PA_SQL_CONNECTION_H;
1.91 moko 19:
1.54 paf 20: // globals
21:
1.78 paf 22: SQL_Driver_manager* SQL_driver_manager=0;
1.54 paf 23:
24: // consts
25:
1.71 paf 26: const time_t EXPIRE_UNUSED_CONNECTION_SECONDS=60;
27: const time_t CHECK_EXPIRED_CONNECTIONS_SECONDS=EXPIRE_UNUSED_CONNECTION_SECONDS*2;
1.54 paf 28:
29: // helpers
30:
1.71 paf 31: const String& SQL_Driver_services_impl::url_without_login() const {
32: String& result=*new String;
33: result << furl->mid(0, furl->pos(':')) << "://****";
34:
1.84 paf 35: size_t at_pos=0;
36: size_t new_at_pos;
37: while( (new_at_pos=furl->pos('@', at_pos+1))!=STRING_NOT_FOUND)
38: at_pos=new_at_pos;
39: if(at_pos)
1.71 paf 40: result << furl->mid(at_pos, furl->length());
1.54 paf 41:
42: return result;
43: }
44:
1.80 paf 45: void SQL_Driver_services_impl::transcode(const char* src, size_t src_length,
46: const char*& dst, size_t& dst_length,
47: const char* charset_from_name,
48: const char* charset_to_name
49: )
50: {
51: try {
1.83 paf 52: // to speed up sql transcode [lots of charsets::get-s -- twice for each cell]
53: // without complicating sql driver API
54: // we need to cache couple of name->charset pairs
55: // assuming pointers to names are are NOT to local vars
56:
57: struct cache_record {
58: const char* name;
59: Charset* object;
60: } cache[2]={{0,0}, {0,0}};
61:
62: Charset* charset_from_object;
63: Charset* charset_to_object;
64: if(charset_from_name==cache[0].name) {
65: charset_from_object=cache[0].object;
66: } else {
67: cache[0].name=charset_from_name;
68: cache[0].object=charset_from_object=&charsets.get(charset_from_name);
69: }
70: if(charset_to_name==cache[1].name) {
71: charset_to_object=cache[1].object;
72: } else {
73: cache[1].name=charset_to_name;
74: cache[1].object=charset_to_object=&charsets.get(charset_to_name);
75: }
76:
1.80 paf 77: String::C result=Charset::transcode(String::C(src, src_length),
1.83 paf 78: *charset_from_object,
79: *charset_to_object);
1.80 paf 80: dst=result.str;
81: dst_length=result.length;
82: } catch(const Exception& e) {
83: _throw(SQL_Error(e.type(), e.comment()));
84: } catch(...) {
85: _throw(SQL_Error(0, "unknown error while transcoding in sql driver"));
86: }
87: }
88:
1.54 paf 89: // helpers
90:
1.71 paf 91: static void expire_connection(SQL_Connection& connection, time_t older_dies) {
1.54 paf 92: if(connection.connected() && connection.expired(older_dies))
93: connection.disconnect();
94: }
1.71 paf 95: static void expire_connections(SQL_Driver_manager::connection_cache_type::key_type /*key*/,
96: SQL_Driver_manager::connection_cache_type::value_type stack,
97: time_t older_dies) {
1.73 paf 98: for(size_t i=0; i<stack->top_index(); i++)
1.71 paf 99: expire_connection(*stack->get(i), older_dies);
1.54 paf 100: }
101:
102: // SQL_Driver_manager
103:
1.92 ! moko 104: SQL_Driver_manager::SQL_Driver_manager(): prev_expiration_pass_time(0) {}
1.54 paf 105:
106: SQL_Driver_manager::~SQL_Driver_manager() {
1.86 paf 107: connection_cache.for_each<time_t>(expire_connections, time(0)+(time_t)10/*=in future=expire all*/);
1.54 paf 108: }
109:
1.71 paf 110: /// @param aurl protocol://[driver-dependent]
111: SQL_Connection* SQL_Driver_manager::get_connection(const String& aurl,
1.80 paf 112: Table *protocol2driver_and_client,
1.88 misha 113: const char* arequest_charset,
114: const char* adocument_root) {
1.54 paf 115: // we have table for locating protocol's library
116: if(!protocol2driver_and_client)
1.87 misha 117: throw Exception(PARSER_RUNTIME,
1.71 paf 118: &aurl,
1.54 paf 119: "$"MAIN_SQL_NAME":"MAIN_SQL_DRIVERS_NAME" table must be defined");
120:
121: // first trying to get cached connection
1.71 paf 122: SQL_Connection* connection=get_connection_from_cache(aurl);
1.58 paf 123: if(connection) {
1.71 paf 124: connection->set_url();
1.58 paf 125: if(!connection->ping()) { // we have some cached connection, is it pingable?
126: connection->disconnect(); // kill unpingabe=dead connection
127: connection=0;
1.54 paf 128: }
129: }
130:
1.71 paf 131: char *url_cstr;
1.58 paf 132: if(connection)
1.71 paf 133: url_cstr=0; // calm, compiler
1.54 paf 134: else { // no cached connection or it were unpingabe: connect/reconnect
1.71 paf 135: url_cstr=aurl.cstrm();
136: if(!strstr(url_cstr, "://"))
1.87 misha 137: throw Exception(PARSER_RUNTIME,
1.71 paf 138: aurl.length()?&aurl:0,
1.62 paf 139: "connection string must start with protocol://");
1.54 paf 140:
1.71 paf 141:
142: char *protocol_cstr=lsplit(&url_cstr, ':');
1.54 paf 143: // skip "//" after ':'
1.71 paf 144: while(*url_cstr=='/')
145: url_cstr++;
146: const String& protocol=*new String(protocol_cstr);
1.54 paf 147:
148: SQL_Driver *driver;
149: // first trying to get cached driver
1.71 paf 150: if(!(driver=get_driver_from_cache(protocol))) {
1.54 paf 151: // no cached
1.71 paf 152: const String* library=0;
153: const String* dlopen_file_spec=0;
1.70 paf 154: Table::Action_options options;
1.71 paf 155: if(protocol2driver_and_client->locate(0, protocol, options)) {
156: if(!(library=protocol2driver_and_client->item(1)) || library->length()==0)
1.87 misha 157: throw Exception(PARSER_RUNTIME,
1.71 paf 158: 0,
1.54 paf 159: "driver library column for protocol '%s' is empty",
1.71 paf 160: protocol_cstr);
1.54 paf 161: dlopen_file_spec=protocol2driver_and_client->item(2);
162: } else
1.87 misha 163: throw Exception(PARSER_RUNTIME,
1.71 paf 164: &aurl,
1.54 paf 165: "undefined protocol '%s'",
1.71 paf 166: protocol_cstr);
167:
1.92 ! moko 168: pa_dlinit();
1.54 paf 169:
1.90 misha 170: const char* filename=library->taint_cstr(String::L_FILE_SPEC);
1.54 paf 171: lt_dlhandle handle=lt_dlopen(filename);
1.79 paf 172: if (!handle) {
173: const char* error=lt_dlerror();
1.62 paf 174: throw Exception(0,
1.54 paf 175: library,
1.79 paf 176: error?error:"can not open the module");
177: }
1.54 paf 178:
1.86 paf 179: SQL_Driver_create_func create=(SQL_Driver_create_func)(lt_dlsym(handle,
180: SQL_DRIVER_CREATE_NAME));
1.54 paf 181: if(!create)
1.62 paf 182: throw Exception(0,
1.54 paf 183: library,
184: "function '"SQL_DRIVER_CREATE_NAME"' was not found");
185:
186: // create library-driver!
187: driver=(*create)();
188:
189: // validate driver api version
190: int driver_api_version=driver->api_version();
191: if(driver_api_version!=SQL_DRIVER_API_VERSION)
1.62 paf 192: throw Exception(0,
1.54 paf 193: library,
194: "driver implements API version 0x%04X not equal to 0x%04X",
195: driver_api_version, SQL_DRIVER_API_VERSION);
196:
197: // initialise by connecting to sql client dynamic link library
1.71 paf 198: char* dlopen_file_spec_cstr=
199: dlopen_file_spec && dlopen_file_spec->length()?
1.90 misha 200: dlopen_file_spec->taint_cstrm(String::L_AS_IS):0;
1.71 paf 201: if(const char* error=driver->initialize(dlopen_file_spec_cstr))
1.62 paf 202: throw Exception(0,
1.54 paf 203: library,
204: "driver failed to initialize client library '%s', %s",
1.71 paf 205: dlopen_file_spec_cstr?dlopen_file_spec_cstr:"unspecifed",
1.54 paf 206: error);
207:
208: // cache it
1.71 paf 209: put_driver_to_cache(protocol, driver);
1.54 paf 210: }
211:
1.88 misha 212: connection=new SQL_Connection(aurl, *driver, arequest_charset, adocument_root);
1.71 paf 213: // associate with pool[request] (deassociates at close)
214: connection->set_url();
1.54 paf 215: }
216:
1.58 paf 217: // if not connected yet, do that now, when connection has services
218: if(!connection->connected())
1.71 paf 219: connection->connect(url_cstr);
1.58 paf 220: // return autoclosing object for it
1.71 paf 221: return connection;
1.54 paf 222: }
223:
1.71 paf 224: void SQL_Driver_manager::close_connection(connection_cache_type::key_type url,
225: SQL_Connection* connection) {
1.54 paf 226: put_connection_to_cache(url, connection);
227: }
228:
229:
230: // driver cache
231:
1.71 paf 232: SQL_Driver *SQL_Driver_manager::get_driver_from_cache(driver_cache_type::key_type protocol) {
1.54 paf 233: SYNCHRONIZED;
234:
1.71 paf 235: return driver_cache.get(protocol);
1.54 paf 236: }
237:
1.71 paf 238: void SQL_Driver_manager::put_driver_to_cache(
239: driver_cache_type::key_type protocol,
240: driver_cache_type::value_type driver) {
1.54 paf 241: SYNCHRONIZED;
242:
1.71 paf 243: driver_cache.put(protocol, driver);
1.54 paf 244: }
245:
246: // connection cache
247: /// @todo get rid of memory spending Stack [zeros deep inside got accumulated]
1.71 paf 248: SQL_Connection* SQL_Driver_manager::get_connection_from_cache(connection_cache_type::key_type url) {
1.54 paf 249: SYNCHRONIZED;
250:
1.71 paf 251: if(connection_cache_type::value_type connections=connection_cache.get(url))
252: while(!connections->is_empty()) { // there are cached connections to that 'url'
253: SQL_Connection* result=connections->pop();
1.54 paf 254: if(result->connected()) // not expired?
255: return result;
256: }
257:
258: return 0;
259: }
260:
1.71 paf 261: void SQL_Driver_manager::put_connection_to_cache(
262: connection_cache_type::key_type url,
263: SQL_Connection* connection) {
1.54 paf 264: SYNCHRONIZED;
265:
1.71 paf 266: connection_cache_type::value_type connections=connection_cache.get(url);
1.54 paf 267: if(!connections) { // there are no cached connections to that 'url' yet?
1.71 paf 268: connections=new connection_cache_element_base_type;
1.54 paf 269: connection_cache.put(url, connections);
270: }
1.71 paf 271: connections->push(connection);
1.54 paf 272: }
273:
274: void SQL_Driver_manager::maybe_expire_cache() {
275: time_t now=time(0);
276:
277: if(prev_expiration_pass_time<now-CHECK_EXPIRED_CONNECTIONS_SECONDS) {
1.86 paf 278: connection_cache.for_each<time_t>(expire_connections, time_t(now-EXPIRE_UNUSED_CONNECTION_SECONDS));
1.54 paf 279:
280: prev_expiration_pass_time=now;
281: }
282: }
283:
1.76 paf 284: static void add_connection_to_status_cache_table(SQL_Connection& connection, Table* table) {
1.54 paf 285: if(connection.connected()) {
1.76 paf 286: ArrayString& row=*new ArrayString;
1.54 paf 287:
288: // url
1.76 paf 289: row+=&connection.services().url_without_login();
1.54 paf 290: // time
1.58 paf 291: time_t time_used=connection.get_time_used();
1.76 paf 292: row+=new String(pa_strdup(ctime(&time_used)));
1.54 paf 293:
1.76 paf 294: *table+=&row;
1.54 paf 295: }
296: }
1.76 paf 297: static void add_connections_to_status_cache_table(
298: SQL_Driver_manager::connection_cache_type::key_type /*key*/,
299: SQL_Driver_manager::connection_cache_type::value_type stack, Table* table)
300: {
1.77 paf 301: for(Array_iterator<SQL_Connection*> i(*stack); i.has_next(); )
302: add_connection_to_status_cache_table(*i.next(), table);
1.76 paf 303: }
304:
1.71 paf 305: Value* SQL_Driver_manager::get_status() {
306: Value* result=new VHash;
1.76 paf 307:
1.54 paf 308: // cache
309: {
1.76 paf 310: ArrayString& columns=*new ArrayString;
1.71 paf 311: columns+=new String("url");
312: columns+=new String("time");
1.76 paf 313: Table& table=*new Table(&columns, connection_cache.count());
1.54 paf 314:
1.86 paf 315: connection_cache.for_each<Table*>(add_connections_to_status_cache_table, &table);
1.54 paf 316:
1.76 paf 317: result->get_hash()->put(*new String("cache"), new VTable(&table));
318: }
1.54 paf 319:
320: return result;
1.57 paf 321: }
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